Cross Reference: /src/sys/kern/subr_time

History log of /src/sys/kern/subr_time_arith.c
Revision	Date	Author	Comments
1.3	01-Apr-2025	riastradh	branches: 1.3.4; itimer(9): Fix various bugs in arithmetic. The arithmetic still spuriously rejects very large inputs, but we don't have to deal with them for another century, so I'll do that in a separate commit later without too much urgency. In particular, when the clock reads later than the year 2262, we can't represent it in a signed 64-bit number of nanoseconds since 1970. It is possible to compute a two-digit mixed-radix 96-bit quotient and remainder in struct timespec arithmetic, but it's a lot more trouble to write out the details. In particular, even if we limit intervals to be positive 63-bit numbers of nanoseconds, computing the 64-bit remainder (1e9 * tv_sec) % interval is annoying; we could break it into (1e9 % interval) * (tv_sec % interval) but that's still a 30-bit x 63-bit product. We can break it down further into the high 31 bits and the low 32 bits of tv_sec but that's getting into a lot of details of multiprecision arithmetic. And this is good enough for more than the next century. PR kern/58922: itimer(9): arithmetic overflow PR kern/58925: itimer(9) responds erratically to clock wound back PR kern/58926: itimer(9) integer overflow in overrun counting PR kern/58927: itimer(9): overrun accounting is broken
1.2	01-Apr-2025	riastradh	t_time_arith: Rethink the correct results and add some more cases. PR kern/58922: itimer(9): arithmetic overflow PR kern/58925: itimer(9) responds erratically to clock wound back PR kern/58926: itimer(9) integer overflow in overrun counting PR kern/58927: itimer(9): overrun accounting is broken
1.1	22-Dec-2024	riastradh	kern: Move some purely arithmetic routines to subr_time_arith.c. Preparation for testing and fixing: PR kern/58922: itimer(9): arithmetic overflow PR kern/58925: itimer(9) responds erratically to clock wound back PR kern/58926: itimer(9) integer overflow in overrun counting PR kern/58927: itimer(9): overrun accounting is broken
1.3.4.2	02-Aug-2025	perseant	Sync with HEAD
1.3.4.1	01-Apr-2025	perseant	file subr_time_arith.c was added on branch perseant-exfatfs on 2025-08-02 05:57:42 +0000

OpenGrok